Progress in Computing Applications KHALDI Amine 7 2 2018 https://doi.org/10.6025/pca/2018/7/2/68-76 http://www.dline.info/pca/fulltext/v7n2/pcav7n2_3.pdf In this paper we present a Diffie-Hellman key exchange implementation using stéganographied images. The Diffie-Hellman key exchange requires the use of digital signature or creating a secure channel for data exchanging to avoid the man in the middle attack. But the using steganography made invisible the data exchange to a potential attacker. This approach has never been proposed and allowed us to generate a symmetric 128-bit key between two users without use of digital signature or secure channel. However, it works only on bitmap images, heavy images and sensitive to compression.